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April 26, 1927.

A. L. DE LEEUW THREADING MECHANISM Original F'iled Jan. 30, 1923 16 Sheets-Sheet 16 lit) Patented Apr. 26, 1927.

PATENT OFFICE.

ADOLPH L. DE LEEUW, OF PLAINFEELD, NEW JERSEY, ASSIGNOR TO THE GOSS AND DE LEEUW MACHINE COMPANY, OF NEW BRITAIN, CONNECTICUT, A CORPORA- TION OF CONNECTICUT.

THREADING MECHANISM.

Original application filed January 30, 1923 Serial No. 615,884. Divided and this application file December 23, 1924.

This application is a division of one serially numbered 615,884 tiled by me on J anuart 30. 1923 and entitled lilachinc tool; the ini'cntion of this divisional applicition being; directed to the proposition oi? cutting threads positively and perfectly in a given piece of work at the same time that other tooling operations are being performed either on that particular piece or ona companion piece.

In automatic machine-tools, provision is habitually made for accomplishing ,a preliminary relative movement between th tool-carrier and thewvork-carrier for the purpose of bringing the work and tool into proximity, whereupon the tool is caused to enter and form the work. Such machines often are required to cut threads in addilion to performing other tooling operations and, to save time, it is essential that the threading should be done while the mechanism is operating in a manner compatible with its other functions. Heretofore, the tapping means has been impositive to the or: out oi depending upon the self-feeding properties of a tap. This has, however, resulted in a pronounced lack of precision due to an inability ot' the tap to take hold immediately and to feed itself Without any and to continue to feed in, as well as out, without any departure whatsoever from the true lead of the thread. lVhile this det'eciv exhibited more emphatically in work of the softer sorts of metal (when the threads often stripped either complete iy in thin sections or are so weakened as to be useless) it is dii'hcult even with stronger metal and thicker sections to secure threads in all of the standard pitches conforming to a high standard of precision. ti hrough this invention,however, the principle of selflt'eeding abolished and a -'tive teed is made possible, so that a :ad of any pitch may be cut in any ade of metal and in any section either thin or thicl with absolute precision; all in an automatic -multi-operation. machine without disturbing its major cycle of opcration and without increasing its normal period at operation as will appear herein- Serial No. 757,652.

in the structure of automatic machines, is the construction and arrz'ingeinent of several of the tool-spindles and their co-ordinatc m chanisin in a head-stock, while another of the spindles, preferably constituting a threading or reaming spindle, is carried independently by a headmovable as a. unitary structure along the bed of the machine. feature which permits the use of the longest bed possible in the space availal'ile, or required by the extent of the article to be operated upon, and the limits of adjustment may be spaced much more widely than where the head is fixed, as in exisiing structures of this type. i r

A further important object of my improved organization oi" the Work-supporting head and the tool-spindle head is the provision of n'ieans for positive correlation of the relalivo movements of these heads, by a liaison member which insures their coaction, and increases greatly the stability of the mechanism during treatment of the Work, eliminating the tciidency to chatter, and obviating much of the unnecessary wear upon tools and strain upon the working parts which has characterized machines 0t this class. the construction and arrangement of this novel liaison ,mcmber being: such as to provide for its automatic action.

My invention comprises i'un'uerous immovements in the structure of the mutiple tool-spindle hcad, among which improve menls is the important provision for apply iug individual speed-changc gears tor each spindle. so that the speed of individual tools may be varied m lcctivcly, and that of each spindle at any time, without attesting the speed at which any other tool is driven. so that the speed of each spindle maybe varied in accordance with the requirements of the work it is to pertorn'i at any time: as tor example, in tapping operations, the tap cun be driven at different speeds, by, means oi special change-speed gears, and external and internal threads can be formed ally proper rates. 7

My improvements also provide for performing internal and external threading operations simultaneously, in a manner which is novel in chucking-machines.

In this connection I provide a novel moans, preferably coml'irising positively at individuacting leaCl-screwv"devices, to impart a .posi

tive feed to the threading or tapping=spin dle, and I provide novel means to prevent relative :motion between the -turret-head and the threading-head, which Fi also advanced to its preliminary position positively by the sliding motion of the head carrying the threading spindle.

By this positive feed of the taps, I secure a fi iaii'ness and accii racy in their operation which has only been possible hereto-tore "in machines organized for chasing operations exclusively, and l have therefore made m reorganized cliu ng jnachinc more universal in its capabi ities of use, tending also to obviate the need in a shop 01 special "tapping apparatus for the type of work on which i ny machine'is tooperate.

in existing inachifnes of this type, *the revcrs'i-ng'of the spindle used as a threadingspindle is done from the main cam-shaft, from which arrangement results the dis-ad vantage that "any change in the production time ot the machine aflects the setting-of this spindle, and I have eliminated this disadvantageby fitting to a slnalldrum, which revolves with the ,tl'ireading-spindle, the camdogs Which-control the movements of the latter, so that it the machine for ten threads on the work, it will make the ten threads regardless of whether the machine is ru'nni'ng. in ten seconds orfiii'ty seconds.

Other objects and advantages i'vill be in part indicated in the following description and in part rendered apparent therefrom in connection with the annexed drawings.

To enable others skilled in the art so fully to apprehend the underlying features hereof thatthey may embody the same in the various ways contemplated by this invention, drawings depicting a preferredztypical constriiction have been annexed as a part of this disclosure and, in such drawings, like characters of reference denote corresponding parts throughout all the views, of which Fig. '1 is view in front elevation of a multiple spindle automaticmetail-working machine in the nature of a chucking-machine and which embodies characteristics of this invention, Fig.2 is a view in front elevation on an enlarged scale of the multi'ple toolspindle headstock, isolated. Fig. 3 is an endelevation of the headstock, with portions of the cover, etc., shown "in section, to reveal certain operating *part's. 4 is a view thereof in rear elevation, with the drivingansy removed. is "a vertical section, taken on the line 07 1's of Fig. 6 is a vertical section on the line mF-m of Fig. 3., 7 *is a view inflongitudi'nal section, taken on the line 1LE7-L7 of Fig. 6. showing a spring-contrdlled detent, isolated. Fig. 8 is a plan view of a co operating trip, also isolated. and partly broken away to reveal described more at length hereinafter. 9 lsa similar VIEW 1n continuation oi Fig. 9. F1.g. -9 s hkewise a view in continuation interior structure. Fig. 9 is a sectional develo-pinent of the headstock gearing, to be Fig.

of Fig. 9. Fig. 10 is iragmentary,sectional view of the pump drive-gear, and its supporting lp'arts, Fig. 11 is a fragmentary, detail View of a substitute bearing for use in reaming operations. is a view on an enlarged scale, in front-elevation, of the turret-head of the machine shown in F i 1, isolated, except that with the turret-head is shown the adjacent portion of the bed, parts "being omitted and parts broken away to reveal interior structure. Fig. 18 is a plan view of the turret-head. Fig. 14: is an e'ndelevation thereoi', showing also the adjacent portion of the bed, part of the casing being shown in section, to reveal geariii-g. 15 is a vertical section of the turret-head, taken on the line m w of Fig. 12, parts *be-ing broken away to reveal inner construction. Fig. 16 is an elevation of my preferred form of turret, the same being shown in place upon the turret-head, with chucking devices mounted in working position, parts being omitted and parts broken away to reveal more clearly the structure of the turret and chucking devices. Fig. 17 is a :diametral, sectional view of the turret, taken on the line m w" of Fig. 16, the turret being isolated with one of the chucking devices, shown in elevation. Figs. 18 and 1'9 are respectively views on a reduced scale in front elevation and side-elevation, respectively, of the isolated turret oi Fig. 17 Fig. 20 *being a 'diainetral section thereof, on the line w -'m of Fig. 18. Figs. 21, 22 and 23 are respectively views 'in front-elevation, e'ndeelevation and sideelevation, oi the isolatedchucking-device shown in Fig. 17. Fig. 24 *is a view in front elevation of another form of chucking-device, isolated. Figs. 25 and 26 are viewsthereof in endelevation and side-elevation, respectively. Fig. 27 is a fragmentary sectional view of'the isolated clutch operating mechanism. Fig. 28 is an elevation, taken in the direction of the arrow on Fig. 16, showing in isolated form a cover-plate which is shown at the left in Fig. 16. Fig. 29 is a similar view of the reverse side thereof. Fig. 30 is a longitudinal sectional view on the line ne -01 of Fig. 29. Fig. 31 is a transverse. sectional. View on the line m w ot Fig. 29, and Figs. 32 and .33 are similar transverse, sectional viewstaken respectively on the lines m and m -0W of Fig. 29. Fig. 34 is a tragni'entarfy sectional view on the line m"*m of Fig. 28. Fig. 35 is a reversed. diametral section of the turret-head, showing the development of the operating mechanism.

In the illustrated embodiment of the invention, -the metal-working machine in the llsi nature of a chucking-machine assumes in general the form characteristic of automatic n'ietal-working machines and, in accordance with my invention, is shown as comprising a bed A, with a work-supporting head B and tool-spindle head C, mount-ed respectively in sliding relation to the bed and to each other.

The bed A may be of any suitable material, contour and dimensions required by the work to be performed, in accordance with my invention, and is shown as generally rectangular in plan, preferably tapering upwardly and outwardly from its base 1'6 at the ends a and preferably sloping inward, slightly, along the lower portions (Z2 of its front and rear, and having in its preferred form a drip-pan a for lubricant, substantially co-extensivewith its length, being preferably formed integrally with the bed structure, to avoid leaky joints and to afford greater simplicity and rigidity of structure, all in accordance with my invention.

Above the drip-pan a, rises headstock a formed integrally with the bed, or connected suitably therewith, and in this head stock are mounted rotatably a plurality of tool-spindles, of which there may be any suitable number, three being shown, designated respectively by the reference characters A, A? and A while at A" is shown another tool-spindle, mounted rotatably in bearings a, supported by the tool-spindle head C, the latter comprising also a slide mounted on ways a formed upon the headstock a The work-supporting head B is carried by a portion a ofthe bed, rising above the drip-pan (L3, at a suitable distance from, and in opposed relation to, the headstock a}, and this work-supporting head may be of any character suitable for effecting the portion of my invention relating thereto, its preferred form being that of a turret-head con'iprising a slide I) mounted upon ways a with which the bed-portion a is provided. and a turret B, with its co-ordinated instrumentalities arranged compactly within the turret head in accordance with my invention, and which will be hereinafter described in detail.

General organization of the operat ng mechanism.

- motor, or provided with a pulley D, to receive a belt D running from a motor or any suitable source of power; the headstock (0 containing also a set of gears and shafts (see Fig. 9*) including gears 1, 2, shaft 8, bevel-gears 1, 5, shaft 6, and gears 7, 8, 9 and 10, to actuate the tool-spindles A, A and A; also a set of gears and shafts including pinions 11 and 12, bevel-gears 13 and 14, shaft 15, and gears 16, 17 and 18, to actuate the feed-shaft 19 for the turrethead and its co-ordinated mechanism, the gear 18 serving also, through gears 20 and 21 (see Figs. 3, 4i and 9) to actuate the cutting solution-pump E; also a set of gears 2 nd shafts including pinion 22, gear 23, shaft and gears 25 and 26, to actuate the shaft 27, which constitutes the central shaft of a system to operate the tool-spindle A and its coordinated mechanisms, which will be described in detail in the portion of this specification relating to that element of the machine.

As part of this general organization of my improved machine I have provided a novel liaison member F which serves to coordinate the sliding movements of the toolspindle hea d C and the turret-head B, relatively to each other, the former deriving its feeding movements from the latter, as will be explained more fully.

From the above brief description, it can be understood readily that the operations of the machine are completely organized and co-ordinated, to permit the several instrumentalities to be actuated, through a main driving-shaft, common thereto, by a single source of power, such as a belt or a motor, insuring a complete harmony in their cooperation at all times, and completely avoiding the errors of machining, breakages of working parts, and delays for replacements and adjustments, which result necessarily from the employment hitherto of plural belts or plural motors for various instrumentalitics.

Gen/1:11;] and individual (Ferm cs a," spew],

Before proceeding with detailed dcsm'iplion of the component instrumcntalitics grouped in' their general relationship as above, it may be noted briefly that I have provided for general speed-changes at set eral regions in the above general organization, notably at the region occupied by the gears 1 and 2, which may be exchanged in position to give a general change of speed for the tool-spindle actuating mechanism driven thereby, and in place ofthe gears 1 and 2 may be substituted change-gears of different relative sizes, to yield an extensive range of general speeds, while a further 'ange of general speeds for the tool-spindles A, A and A may be secured by exchanging their common actuating gear 7 for a gear of any appropriate size, and in All connection therewith changing the intermediate gears 8, of which one is provided for each oil, the tool-spindles A, A A, (see Fig. The speed of the individual *tool spindles A, A A may be changed still further, independently of each other, and independently of any other inst-r umentality in the machine, by suitable changes of their individual sets of gears 9 and 10, (see Fig. 9

Individual ohanges'o'f speed (For the toolspindle A can be elf-acted at the region of the gears 25 and 26, these changes rbeing like ise independent of the speed ot any other n'iechzrnism in the inachine.

"So also, independent changes of speed :for the turrethead l3 and its coordinated insti'unientalities can be eli'eoted, but the description of these chaaiges will be made in the detailed description of the turret head, it being s'iificient to note that, in connection with the complete co-ordination of the several mechanisms o l the machine, it have provided for a thoroi ig h'system of general and independent speetl-chan-ges throughout the machine, so that the operator is not limited in any respect "by the speed oi one mechanism in securing the appropriate speed tor any other mechanism, a novel and advantageous arrangement which I claim broadly for this "type of metal-working machine, as the structure of existing =chucking-1naeliines precludes the possibility of such provision for such wide and independent ranges of speed as I have secured.

The tool-spindle headstock.

vided also for suitable enclosure of the changespeed gears, as by a covera hinged to the headstock at a, and provided with :1 locking device a and this novel provision for enclosure of the plural tool-spindles of such a machine is not limited in its up plication by the number, specific structure or relative positions of the tool-spindlesgall of which may he varied in accordance with the exigencies of the avoid; to be performed in particular installations orembodiments of my invention, the primary object achieved being two-fold, viz, first, to avoid overhang of the Working'parts, and the Weakness and instability of strutiture incidental to such overhang, and secondly to leave no *parts exposed to endanger theoperator-oer distract his attentionyor to be damaged "by blows or the intrusion ot extraneous objects, such as Wrenches, bits of metal the like.

In carrying these objects into etlecn any suitable type of spindle may be employed, and the spindles A, A 1 3 are of as Wellknown type, in general structure, similar to each other, and a general, description of one will suiiic-e, particular reference being had to Fig. 9, which shows enough of one of the spindles and its co-operating bearings to permit a thorough understanding of each spindle, Fregardless of the number employed.

The tool-spindle A, selected for illustration, comprises asha it A preterably having an axial here a in continuation of 'the usual socket 01 to receive the tool. and the head 0 in which this socket is termed, conutes the only exposed, portion of the spindle, preterably, in accordance with my invention, only one .1 Oil this head projecting to permit the ipro sion ot theusual key- Way a wvhile at the other end the spindle extends sufiiciently only to afford an adequate seat (L tor the spindle-diving gear 10, its retaining; nut a and a spacing-ring a", designed :to maintain the nut a in accessible position clear of the teeth Ofrgflttl' 8, the positions of "the respective gears I, 8, 9 and 10, at the extreme left end of the maehine, beinp; unost convenient ttor gear-changing, (see In accordance with 111W invention, the spindlebearinp's are confined ivithin the limits of the headstoek a, suitable bosses, a and a, being provided, zpreii'erably, integral With the'headstoc'k walls, to receive=cooperating tapered bearings parts 66 and a at the heade'nd,and a (L23 at the gear end. The bearing member 60 is preferably split longitudinally, and fits snugly upon a reduced portion a of the spindle-shaft, and compensation for wear can be effected by means of a nut 64 screwed upon tlie'tliread ed shank a thereof, this nut being seated against the inner end of the boss (1 and serving to prevent outward end-shuke of the spindle, through the medium of a collar 0/" fastened by aset-screw (L23 upon the spindle, with an intervening Washer a. A setscrew e serves to prevent rotation of the nut a and a pin a serves to prevent relative rotation of the bearingmembers a and a. Inward end'shalte oi the spindle is prevented by the spindle-head shoulder a. engaged with the outer-end oi the bearing member if", and a protectingring a secured by screwed, is shown to keep particles oi dustand nietal from the bearings.

Art the gear-end bearing, the nut (6 serves to take up wear on the split bearing-member of, and the pin (636 prevents relative rotation of the anen'ibers 0 and 14 While the principal thrust upon the spindle-shatt- A is taken up by a ball-bearinga interposed between a shoulder a on the spindle-shaft A and cup of, the latter being seated against the boss o of .the headstock. and pinnedat a to-the bearing-member e ins lit) 

